13123434512 has 60 divisors (see below), whose sum is σ = 27091472880. Its totient is φ = 6157183488.

The previous prime is 13123434509. The next prime is 13123434581. The reversal of 13123434512 is 21543432131.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1600439 + ... + 1608617.

It is an arithmetic number, because the mean of its divisors is an integer number (451524548).

Almost surely, 2^13123434512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13123434512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13545736440).

13123434512 is an abundant number, since it is smaller than the sum of its proper divisors (13968038368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13123434512 is a wasteful number, since it uses less digits than its factorization.

13123434512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8568 (or 8545 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

Adding to 13123434512 its reverse (21543432131), we get a palindrome (34666866643).

The spelling of 13123434512 in words is "thirteen billion, one hundred twenty-three million, four hundred thirty-four thousand, five hundred twelve".